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Tuesday, 21 October 2014

Modern Trends in Indian AC Transmission System

Long distance bulk power transfer:

The
need to economize investments in generation reserves, sharing of benefits in
utilizing variability in generation mixes and load pattern have given rise to
interconnection of neighboring power systems and development of large power
grids. Rapid increase of load (which is the case in developing countries like
India), remote generation and system interconnections have made it necessary to
transmit more power over longer distances efficiently and easily. Long distance
bulk power transfer is possible only with Extra High Voltage (EHV) and Ultra
High Voltage (UHV) transmission lines.

Research and Development activities:

Priority
is given to research and development activities for the optimization of cost of
power transmission, efficient utilization of existing Right of Way (ROW) and
increased power transfer capability. The recent technological developments and
application of power semi-conductor devices, digital electronics, control
equipments and satellite communication have increased the capabilities of EHV
and UHV AC transmission lines.

Modern Trends in AC Transmission:

The
modern trends in AC transmission are:

1.To utilize Flexible AC
Transmission Systems (FACTS) employing power electronic based and other static
controllers to enhance the controllability and capability of AC transmission
lines.

2.To opt for higher transmission voltages
exceeding the EHV range. Transmission voltage of 765 kV AC has been introduced in India in the
year 2007. Research and development is going on for the next higher voltage of
1200 kV UHV AC transmission system. In this regard a 1200 kV test station and
test line at Bina (Madhya Pradesh) is in advanced stages of research and
development.

3.To deploy satellite imagery
technique (which is supposed to enhance the transmission line survey). Survey
techniques are improved through GIS and Airborne Laser Terrain Mapping (ALTM) or Light Detection and Ranging (LiDAR). Laser mapping produces the detailed elevation measurements at a faster rate and accuracy. It can be used at locations where the approach is limited or restricted. With this technique, long transmission corridor can be mapped with speed to determine the exact location of towers. The same data can be used for monitoring the transmission lines, for it's repair and modification activities.

4.Tall and multi-circuit towers are
increasingly being used to avoid deforestation, protection of wild life and
effective utilization of existing ROW.

5.Recent trend is to use
multi-conductor bundled conductors having four, six, and eight sub-conductors.

6.To use high temperature endurance
conductors for increased loading and higher power transfer capability.

7.More and more use of compact gas insulated substations of 765 kV and 1200 kV class.

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About Me

Hello, I am Manoj Nair, specialized in Heavy Electrical Equipment (M-Tech). Also Life Member of ISTE and Associate Member of IE(India).

Currently I am working as Consultant in the field of Electrical Distribution and Energy Conservation. Also worked as Faculty in Electrical Engg, engaged in teaching post graduate and under graduate students of Electrical & Electronics engineering. I have authored/co-authored 8 books on various subjects of electrical engineering.

Also worked in Electric Utility as an engineer and handling the various jobs related to installation and maintenance of distribution lines, transformers and the metering equipments.

In the free time I switch over to blogging, discussions related to power system, developing MATLAB coding for problems related to power system.